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Can Vitamin D Supplementation Cause Kidney Damage?
Vitamin D deficiency is not simply a consequence of kidney disease—it can actively accelerate renal injury. Proper vitamin D signaling suppresses harmful hormonal pathways, protects glomerular structures, and limits fibrosis. Concerns about kidney damage stem from rare cases of vitamin D toxicity, not physiologic replacement. When dosed appropriately and monitored, vitamin D supports kidney health rather than harming it.

David Stephen Klein, MD FACA FACPM
20 hours ago3 min read


Why Can’t My Doctor Find My Thyroid Problem?
Many patients experience fatigue, weight gain, cold intolerance, and brain fog despite being told their thyroid tests are “normal.” This article explains why thyroid disease is frequently missed, how temperature, genetics, inflammation, diet, and hormone conversion affect symptoms, and why a normal TSH does not rule out clinically meaningful hypothyroidism. Understanding thyroid function beyond basic labs often leads to answers patients have been seeking for years.

David Stephen Klein, MD FACA FACPM
3 days ago6 min read


Persistent Fatigue Is Not a Diagnosis
Persistent fatigue is not a diagnosis but a signal of underlying physiologic imbalance. Chronic low energy is often driven by overlooked metabolic dysfunction, hormone signaling abnormalities, sleep disruption, immune activation, or autonomic imbalance—frequently despite “normal” labs. A systematic, physician-led evaluation can uncover reversible causes and restore vitality rather than merely suppress symptoms.

David S. Klein, MD FACA FACPM
Jan 284 min read


Influenza Is Rising — COVID Is Still Circulating. Test Frequently
Influenza activity is rising as respiratory virus season accelerates, while COVID-19 continues to circulate at the same time. Because these two viruses often cause nearly identical early symptoms—fever, body aches, fatigue, sore throat, and cough—timely testing has become essential. The article emphasizes the importance of having combined at-home influenza and COVID tests readily available and using them immediately at symptom onset, rather than waiting several days.
Early i

David S. Klein, MD FACA FACPM
Jan 54 min read


Have a Happy Holiday: Detox Essentials
Detoxification is often misunderstood as a fad, yet it remains a central physiological process essential for human survival. The holiday season—marked by stress, alcohol consumption, disrupted sleep, and poor dietary choices—places a substantial metabolic burden on the liver, gallbladder, kidneys, lungs, and intestinal tract. This blog outlines the science behind the body’s three-phase detox pathway and explains how targeted nutritional support can enhance natural clearance m

David S. Klein, MD FACA FACPM
Dec 2, 202510 min read


Understanding the Connection Between Hypothyroidism and Atherosclerotic Heart Disease
Hypothyroidism is far more than a problem of low metabolism—it’s a quiet amplifier of vascular disease. By addressing thyroid imbalance, we not only restore energy and mental clarity but also protect the heart from atherosclerotic injury. Managing these conditions together yields the best outcomes for long-term vitality and longevity.

David S. Klein, MD FACA FACPM
Nov 13, 20255 min read
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